Book/Report

FZJ-2018-05106

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Ein hadronisches Modell für die konsistente Behandlung der Streuung und Annihilation des Antinukleon-Nukleon Systems

Mull, V. (Corresponding author)FZJ*

1993
Forschungszentrum Jülich GmbH Zentralbibliothek Verlag Jülich

Please use a persistent id in citations: http://hdl.handle.net/2128/19609

Report No.: Juel-2844

Abstract: In this work a consistent description of the $\overline{N}N$ scattering and annihilation with a hadronic model is presented. The elastic $\overline{N}N$ interaction is abtained from the Bonn NN potential via a G-parity transformation. For the annihilation part, a consistent, partly microscopic description is constructed treating the most important two meson channels explicitly and accounting for the rest by a phenomenological optical potential of Gaussian form. Transitions from the antibaryon-baryon sector to the meson sector are mediated via the exchange of N, $\Delta$, $\Lambda$, $\Sigma$ and Y* byryons. $\overline{N}N$ scattering observables, branching rations and cross sections for the annihilation into two mesons and bound states are calculated consistently. Results are compared with former calculations and the experimental data. The agreement with the data is good. The importance of meson-meson interactions in the final state is studied at the example of the particular annihilation channel $\overline{N}N \rightarrow \pi \pi$. A full coulped channels calculation with the channels $\overline{N}N, \pi \pi, \overline{K}K$ and $\rho \rho$ is performed. Interactions and transitions in the meson sector are described by meson-exchange diagrams. Integrated as well as differential cross sections and analyzing powers for the annihilation process $\overline{N}N \rightarrow \pi \pi$ are described with good quality. Results of the coupled channels model for $\pi \pi$ phase shifts and inelasticities above the $\overline{N}N$ threshold are discussed. Effects of the meson-meson interactions of $\overline{N}N$ scattering observables are small. The importance of two-step processes and meson-meson interactions in the final state for the description of the angle-dependent observables in the annihilation process $\overline{N}N \rightarrow \pi \pi$ can be demonstrated.

---

Contributing Institute(s):

1. Publikationen vor 2000 (PRE-2000)

Research Program(s):

1. 899 - ohne Topic (POF3-899) (POF3-899)

---

Database coverage:

---